Carriage-return mechanism for type-writing machines.



O. BENNETT.

CARRIAGE RETURN MECHANISM FOR TYPE WRITING MACHINES.

APPLICATION FILED AUG.2I, I914.

Patent-ed Aw. 31, 1915.

WITNESSES application.

..L ILED RATE '1? or tion.

GRIN BENNETT, OF PLACERVILLE, CALIFORNIA.

CARRIAGE-RETURN MECHANIS IVI FOB TYPE-WRITING- MACHINES.

will enable others skilled in the art to which it appertains to make anduse the same, reference being had to the accompanying drawings, and tothe characters of reference marked thereon, which form'a part of thislhis invention relates to improvements in typewriting machines andparticularly to a mechanism for returning the carriage to normalstarting position by an electrical control apparatus and simultaneously'therewith turning the platen such a distance as may be required. Thiselectrical return mechanism is designed to obviate the necessity ofreturning the carriage to the starting point by hand and also thenecessity of turning the platen by hand or by the hand operatedmechanism now commonly used.

A further object of the invention is to produce a simple and inexpensivedevice and yet one which will be exceedingly effective for the purposesfor which it is designed.

These objects I accomplish by .means of such structure and relativearrangement of parts as will fully appear by a perusal of the followingspecification and claims.

In the drawings similar characters of reference indicate correspondingparts in the several views. v v

Figure 1 is a rear elevation of the framework of a typewriting machineshowing the carriage thereon and my improved return mechanism. Fig. 2 isa fragmentary portion showing the carriage in the position of its limitof travel. Fig. 3 is an end view of the subject matter shown in Fig. 2.Fig. %i is a front view of a core centering structure.

Referring now more particularly to'the characters of reference on thedrawings the numeral 1 designates the frame of a typewriting machine,the numeral 2 vthe carriage which slides thereon, and the numeral 3 theplaten carried by the carriage; Y 3

My invention di 'des itself into two subdivisions, namely, the platenreturn mechanism and the carriage rotating mocha Specification ofLetters latent.

Application filed August 21, 1914. Serial No. 857,842.

and describing first the platen retailing -mechan1sm it is pointed outthat the 'numeral 4 designates an annular ratchet rack fastened on theend of the platen 3. En-

Patented Aug. 31, 1915. L

gageable with this rack 4 is a spring pressed dog 5 turnably mounted ona pin 6 journaled in a small supporting frame 7 .on the carriage 2.-This pin (3 has secured thereto an uppecprojecting cam finger 8 and alower projecting'curved cam f nger 9. As the carriage-2 moves from itsstartingv point to its limit of movement the finger 8 engages a cam 10secured stationary to the frame 1 which engagement causes the shaft 6 torotate to move the spring pressed dog 5 to its limit of movement andlikewise moves the member 9 to its lower limit of movement. Then whenthe carriage 2 is returned to its normal starting position in the manneras will be hereinafter described the curved cam finger 9 engages a camlikewise secured stationary to the frame 1 .;hich action moves such camfinger 9 upwardly and through the medium of the pin 6' moves the springpressed dog 5 downwardly to its limit of movement. Thus since the upperside of the dog 5 is curved and its lower edge is square, when it movesupwardly it will move past the ratches 4:, but when it moves downwardlywill engage one of said ratches and move the platen 3, the amount ofsuch movement being of course adjusted by the amount of movement allowedthe fingers 8 and 9. Thus it will be seen that each time the carriagemoves forward and is returned to the starting point the platen 3 will beauto.-

matically turned thus obviating the necessity of turning it by hand orby a hand controlled mechanism. 1 provide a band spring 9- to engage thefinger member 9 as it moves downwardly so that it will, not move beyondits normal operative position.

Describing now the carriage return mechanism I provide an arm 12 secured.to the front end of the carriage 2 and provided with an eye 13 at itslower end. Projecting through the eye 13 is a core 14; having two pins15 and 16, one on each side of the eye 13, whereby with the movement ofthecore' 14 the arm 12 and incidentally the carriage 2 will be moved.The core 14 moves in the solenoid coil 17 whenever the same is suppliedwith electric current and this electric current is supplied by meansofthe following structure namely: A' wire 18 leads from any suitablesource of supply to the c011 17.

to which it is connected is turned. This shaft 27 extends from the frontto the rear of the machine and is provided with an 'upterminal of thecoil 17 to a hinged spring pressed switch blade20 having a contact point21. Hinged adjacent the switch blade 20 is another switch blade 22having a contact point 23 engageable with the point 21 under certainconditions and normally held out of engagement with the same by means ofa spring 24. A wire 25 leads from the switch blade 23 to the source of 2current" 1 such a device as substantially fulfilsthe obsupply. 1

When it is desired to return the carriage '2 to the starting point a key'26; which is I locatedat the front of the machineis pressed and withthe pressure on this key a shaft 27 wardly projecting arm '28 on itsrear'end which has a bent portion 29 engagingthe switch blade 22 so thatwithth'e operation of the key 26 the blade'22 will be moved on itspivotal point bringing the points 23 and 21 together and connecting theelectric circuit from the source of supply 30 through the wire 18 to thecoil 17 through said coil.

and through the wire '19 to the point 21,

back to the source of supply. This will cause the coil 17 to act on itscore 14; to draw-Z it from the center of the coil, which action willpull on the eye 13 and arm 12 and return the carriage to' normalstarting ositiong; When pressure is taken oil of the ey 26 the spring241- will disengage the points 21 and 23; but to make this actionabsolutely Jv finger.

positive I have provided a projecting member 31 on the arm 12 which withthe backward movement of the carriage 2 engages the switch blade 20 andmoves it away from the switch blade 22 so as tobreak the connectionbetween the points 21 and 23 in a positive manner each time. v

The sudden shock due to the action'of the coil 17 would ordinarily throwthe carriage back with a tremendous jerk but this will be overcome bythe spring tension in the forward escapement of the carriage which wouldbe of any desired type, but preferably of that type shown in my pendingapplication for patent, Ser. Number 857,841 filed August 21st, 191 1,.With the actionof this spring thesudden jerk or jar would be compensated for so as to return the carriage with ease of movement althoughvery rapidly.

The purpose of the pins 15 and 16 engaging the eye 13 instead of havinga fixed connection is to allow the positive centering of 'tion and tomove the other inthefopposite carriage, of an armseouredto said carnage,a solenold c011, the core of said coil-belngt connected with saidarm, asource-of elejcj ect of the invention as set forth herein.

While this specification sets forth in. de-

tail the present and preferred construction of "the device, still inpractice such deviations from such detail may be resorted to as do notform a departure from the'spirit of the invention. I

Having thus described my invention what I claim as new and useful anddesireto' secure by Letters Patent is:

.1. A device of the haracter described dog and suitably journaled, apairof spaced] with said fingers to move one'inrone' direc- 2 tion when thecarriage IDOVGSxlfl'OIlG direc-l direotion when thetarriagemoves"m-:an.. l

other direction, asdesc'ribed.

2. A device of-:- the character-described" comprising the combinationwith a slidable i'j trical energy, wired connections fromsaid source ofelectrical energy. to'saidsolenoid i i a. switch, interposed in. saidwiredfconnecs';

vtions for makingand breaking the electrical circuit from'said source ofelectrical'energ'y to said solenold, saldSWltCh comprisingtwo pivotedmembers having contact omts adapted to be brought into contact'wit eachother, and a finger member ou -said arm-'engageable with one of saidpivotedmembers with one movement. ofsaid carriage, asde scribed. a Intestimony whereof I aflix my signature in presence of two witnesses. vORIN BENNE'E'BP;

Witnesses: STEPHEN N." Bnnwn'rr, FLorn M. BLANGHARD.

(topics of patent may be obtained for five cents each, by addressing.the gommittioner of Entrants,

' Washtngton,fi.3. Y

comprising the combination with a' slid'able carriage and a turnableplaten. mounted on said: carriage, of an.ann ular. rack mounted -'j v onsaid platen, a spring-presseddog'engag ing said rack, aturnabl'e'pinsecured to said through the points 21 and 23 and wire 25,c'am fingers on said pinfand cams engageable-

